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When Failure Criterion is Rankine Isotropic, enter Tensile strength σts and Compressive strength σcs.
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When Failure Criterion is Bresler-Pister Isotropic, enter Tensile strength σts, Compressive strength σcs, and Biaxial compressive strength σbc.
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When Failure Criterion is Willam-Warnke Isotropic, enter Tensile strength σts, Compressive strength σcs, and Biaxial compressive strength σbc.
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When Failure Criterion is Ottosen Isotropic, enter the Compressive strength σcs, Ottosen parameters a and b, the Size factor k1, and the Shape factor k2.
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When Failure Criterion is User defined, you enter two expressions describing the Failure criterion g(S), used in the failure index, and the Safety factor sf(S). As an example, if you would like to replicate the von Mises Isotropic criterion with tensile strength 350 MPa, you could enter g(S) as solid.mises/350[MPa]-1 and sf(S) as 350[MPa]/(solid.mises+eps).
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For a detailed description of the various criteria, see Safety Factor Evaluation in the Structural Mechanics Theory chapter.
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